/*
 * Copyright © 2007,2008,2009  Red Hat, Inc.
 * Copyright © 2011,2012  Google, Inc.
 *
 *  This is part of HarfBuzz, a text shaping library.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the
 * above copyright notice and the following two paragraphs appear in
 * all copies of this software.
 *
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * Red Hat Author(s): Behdad Esfahbod
 * Google Author(s): Behdad Esfahbod
 */

#ifndef HB_H_IN
#error "Include <hb.h> instead."
#endif

#ifndef HB_COMMON_H
#define HB_COMMON_H

#ifndef HB_BEGIN_DECLS
# ifdef __cplusplus
#  define HB_BEGIN_DECLS        extern "C" {
#  define HB_END_DECLS          }
# else /* !__cplusplus */
#  define HB_BEGIN_DECLS
#  define HB_END_DECLS
# endif /* !__cplusplus */
#endif

#if defined (_SVR4) || defined (SVR4) || defined (__OpenBSD__) || \
    defined (_sgi) || defined (__sun) || defined (sun) || \
    defined (__digital__) || defined (__HP_cc)
#  include <inttypes.h>
#elif defined (_AIX)
#  include <sys/inttypes.h>
#elif defined (_MSC_VER) && _MSC_VER < 1600
/* VS 2010 (_MSC_VER 1600) has stdint.h */
typedef __int8 int8_t;
typedef unsigned __int8 uint8_t;
typedef __int16 int16_t;
typedef unsigned __int16 uint16_t;
typedef __int32 int32_t;
typedef unsigned __int32 uint32_t;
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
#else
#  include <stdint.h>
#endif

HB_BEGIN_DECLS


typedef int hb_bool_t;

typedef uint32_t hb_codepoint_t;
typedef int32_t hb_position_t;
typedef uint32_t hb_mask_t;

typedef union _hb_var_int_t {
  uint32_t u32;
  int32_t i32;
  uint16_t u16[2];
  int16_t i16[2];
  uint8_t u8[4];
  int8_t i8[4];
} hb_var_int_t;


/* hb_tag_t */

typedef uint32_t hb_tag_t;

#define HB_TAG(c1,c2,c3,c4) ((hb_tag_t)((((uint8_t)(c1))<<24)|(((uint8_t)(c2))<<16)|(((uint8_t)(c3))<<8)|((uint8_t)(c4))))
#define HB_UNTAG(tag)   ((uint8_t)((tag)>>24)), ((uint8_t)((tag)>>16)), ((uint8_t)((tag)>>8)), ((uint8_t)(tag))

#define HB_TAG_NONE HB_TAG(0,0,0,0)
#define HB_TAG_MAX HB_TAG(0xff,0xff,0xff,0xff)
#define HB_TAG_MAX_SIGNED HB_TAG(0x7f,0xff,0xff,0xff)

/* len=-1 means str is NUL-terminated. */
HB_EXTERN hb_tag_t
hb_tag_from_string (const char *str, int len);

/* buf should have 4 bytes. */
HB_EXTERN void
hb_tag_to_string (hb_tag_t tag, char *buf);


/**
 * hb_direction_t:
 * @HB_DIRECTION_INVALID: Initial, unset direction.
 * @HB_DIRECTION_LTR: Text is set horizontally from left to right.
 * @HB_DIRECTION_RTL: Text is set horizontally from right to left.
 * @HB_DIRECTION_TTB: Text is set vertically from top to bottom.
 * @HB_DIRECTION_BTT: Text is set vertically from bottom to top.
 */
typedef enum {
  HB_DIRECTION_INVALID = 0,
  HB_DIRECTION_LTR = 4,
  HB_DIRECTION_RTL,
  HB_DIRECTION_TTB,
  HB_DIRECTION_BTT
} hb_direction_t;

/* len=-1 means str is NUL-terminated */
HB_EXTERN hb_direction_t
hb_direction_from_string (const char *str, int len);

HB_EXTERN const char *
hb_direction_to_string (hb_direction_t direction);

#define HB_DIRECTION_IS_VALID(dir)      ((((unsigned int) (dir)) & ~3U) == 4)
/* Direction must be valid for the following */
#define HB_DIRECTION_IS_HORIZONTAL(dir) ((((unsigned int) (dir)) & ~1U) == 4)
#define HB_DIRECTION_IS_VERTICAL(dir)   ((((unsigned int) (dir)) & ~1U) == 6)
#define HB_DIRECTION_IS_FORWARD(dir)    ((((unsigned int) (dir)) & ~2U) == 4)
#define HB_DIRECTION_IS_BACKWARD(dir)   ((((unsigned int) (dir)) & ~2U) == 5)
#define HB_DIRECTION_REVERSE(dir)       ((hb_direction_t) (((unsigned int) (dir)) ^ 1))


/* hb_language_t */

typedef const struct hb_language_impl_t *hb_language_t;

HB_EXTERN hb_language_t
hb_language_from_string (const char *str, int len);

HB_EXTERN const char *
hb_language_to_string (hb_language_t language);

#define HB_LANGUAGE_INVALID ((hb_language_t) 0)

HB_EXTERN hb_language_t
hb_language_get_default (void);


/* hb_script_t */

/* https://unicode.org/iso15924/ */
/* https://docs.google.com/spreadsheets/d/1Y90M0Ie3MUJ6UVCRDOypOtijlMDLNNyyLk36T6iMu0o */
/* Unicode Character Database property: Script (sc) */
typedef enum
{
  /*1.1*/ HB_SCRIPT_COMMON                      = HB_TAG ('Z','y','y','y'),
  /*1.1*/ HB_SCRIPT_INHERITED                   = HB_TAG ('Z','i','n','h'),
  /*5.0*/ HB_SCRIPT_UNKNOWN                     = HB_TAG ('Z','z','z','z'),

  /*1.1*/ HB_SCRIPT_ARABIC                      = HB_TAG ('A','r','a','b'),
  /*1.1*/ HB_SCRIPT_ARMENIAN                    = HB_TAG ('A','r','m','n'),
  /*1.1*/ HB_SCRIPT_BENGALI                     = HB_TAG ('B','e','n','g'),
  /*1.1*/ HB_SCRIPT_CYRILLIC                    = HB_TAG ('C','y','r','l'),
  /*1.1*/ HB_SCRIPT_DEVANAGARI                  = HB_TAG ('D','e','v','a'),
  /*1.1*/ HB_SCRIPT_GEORGIAN                    = HB_TAG ('G','e','o','r'),
  /*1.1*/ HB_SCRIPT_GREEK                       = HB_TAG ('G','r','e','k'),
  /*1.1*/ HB_SCRIPT_GUJARATI                    = HB_TAG ('G','u','j','r'),
  /*1.1*/ HB_SCRIPT_GURMUKHI                    = HB_TAG ('G','u','r','u'),
  /*1.1*/ HB_SCRIPT_HANGUL                      = HB_TAG ('H','a','n','g'),
  /*1.1*/ HB_SCRIPT_HAN                         = HB_TAG ('H','a','n','i'),
  /*1.1*/ HB_SCRIPT_HEBREW                      = HB_TAG ('H','e','b','r'),
  /*1.1*/ HB_SCRIPT_HIRAGANA                    = HB_TAG ('H','i','r','a'),
  /*1.1*/ HB_SCRIPT_KANNADA                     = HB_TAG ('K','n','d','a'),
  /*1.1*/ HB_SCRIPT_KATAKANA                    = HB_TAG ('K','a','n','a'),
  /*1.1*/ HB_SCRIPT_LAO                         = HB_TAG ('L','a','o','o'),
  /*1.1*/ HB_SCRIPT_LATIN                       = HB_TAG ('L','a','t','n'),
  /*1.1*/ HB_SCRIPT_MALAYALAM                   = HB_TAG ('M','l','y','m'),
  /*1.1*/ HB_SCRIPT_ORIYA                       = HB_TAG ('O','r','y','a'),
  /*1.1*/ HB_SCRIPT_TAMIL                       = HB_TAG ('T','a','m','l'),
  /*1.1*/ HB_SCRIPT_TELUGU                      = HB_TAG ('T','e','l','u'),
  /*1.1*/ HB_SCRIPT_THAI                        = HB_TAG ('T','h','a','i'),

  /*2.0*/ HB_SCRIPT_TIBETAN                     = HB_TAG ('T','i','b','t'),

  /*3.0*/ HB_SCRIPT_BOPOMOFO                    = HB_TAG ('B','o','p','o'),
  /*3.0*/ HB_SCRIPT_BRAILLE                     = HB_TAG ('B','r','a','i'),
  /*3.0*/ HB_SCRIPT_CANADIAN_SYLLABICS          = HB_TAG ('C','a','n','s'),
  /*3.0*/ HB_SCRIPT_CHEROKEE                    = HB_TAG ('C','h','e','r'),
  /*3.0*/ HB_SCRIPT_ETHIOPIC                    = HB_TAG ('E','t','h','i'),
  /*3.0*/ HB_SCRIPT_KHMER                       = HB_TAG ('K','h','m','r'),
  /*3.0*/ HB_SCRIPT_MONGOLIAN                   = HB_TAG ('M','o','n','g'),
  /*3.0*/ HB_SCRIPT_MYANMAR                     = HB_TAG ('M','y','m','r'),
  /*3.0*/ HB_SCRIPT_OGHAM                       = HB_TAG ('O','g','a','m'),
  /*3.0*/ HB_SCRIPT_RUNIC                       = HB_TAG ('R','u','n','r'),
  /*3.0*/ HB_SCRIPT_SINHALA                     = HB_TAG ('S','i','n','h'),
  /*3.0*/ HB_SCRIPT_SYRIAC                      = HB_TAG ('S','y','r','c'),
  /*3.0*/ HB_SCRIPT_THAANA                      = HB_TAG ('T','h','a','a'),
  /*3.0*/ HB_SCRIPT_YI                          = HB_TAG ('Y','i','i','i'),

  /*3.1*/ HB_SCRIPT_DESERET                     = HB_TAG ('D','s','r','t'),
  /*3.1*/ HB_SCRIPT_GOTHIC                      = HB_TAG ('G','o','t','h'),
  /*3.1*/ HB_SCRIPT_OLD_ITALIC                  = HB_TAG ('I','t','a','l'),

  /*3.2*/ HB_SCRIPT_BUHID                       = HB_TAG ('B','u','h','d'),
  /*3.2*/ HB_SCRIPT_HANUNOO                     = HB_TAG ('H','a','n','o'),
  /*3.2*/ HB_SCRIPT_TAGALOG                     = HB_TAG ('T','g','l','g'),
  /*3.2*/ HB_SCRIPT_TAGBANWA                    = HB_TAG ('T','a','g','b'),

  /*4.0*/ HB_SCRIPT_CYPRIOT                     = HB_TAG ('C','p','r','t'),
  /*4.0*/ HB_SCRIPT_LIMBU                       = HB_TAG ('L','i','m','b'),
  /*4.0*/ HB_SCRIPT_LINEAR_B                    = HB_TAG ('L','i','n','b'),
  /*4.0*/ HB_SCRIPT_OSMANYA                     = HB_TAG ('O','s','m','a'),
  /*4.0*/ HB_SCRIPT_SHAVIAN                     = HB_TAG ('S','h','a','w'),
  /*4.0*/ HB_SCRIPT_TAI_LE                      = HB_TAG ('T','a','l','e'),
  /*4.0*/ HB_SCRIPT_UGARITIC                    = HB_TAG ('U','g','a','r'),

  /*4.1*/ HB_SCRIPT_BUGINESE                    = HB_TAG ('B','u','g','i'),
  /*4.1*/ HB_SCRIPT_COPTIC                      = HB_TAG ('C','o','p','t'),
  /*4.1*/ HB_SCRIPT_GLAGOLITIC                  = HB_TAG ('G','l','a','g'),
  /*4.1*/ HB_SCRIPT_KHAROSHTHI                  = HB_TAG ('K','h','a','r'),
  /*4.1*/ HB_SCRIPT_NEW_TAI_LUE                 = HB_TAG ('T','a','l','u'),
  /*4.1*/ HB_SCRIPT_OLD_PERSIAN                 = HB_TAG ('X','p','e','o'),
  /*4.1*/ HB_SCRIPT_SYLOTI_NAGRI                = HB_TAG ('S','y','l','o'),
  /*4.1*/ HB_SCRIPT_TIFINAGH                    = HB_TAG ('T','f','n','g'),

  /*5.0*/ HB_SCRIPT_BALINESE                    = HB_TAG ('B','a','l','i'),
  /*5.0*/ HB_SCRIPT_CUNEIFORM                   = HB_TAG ('X','s','u','x'),
  /*5.0*/ HB_SCRIPT_NKO                         = HB_TAG ('N','k','o','o'),
  /*5.0*/ HB_SCRIPT_PHAGS_PA                    = HB_TAG ('P','h','a','g'),
  /*5.0*/ HB_SCRIPT_PHOENICIAN                  = HB_TAG ('P','h','n','x'),

  /*5.1*/ HB_SCRIPT_CARIAN                      = HB_TAG ('C','a','r','i'),
  /*5.1*/ HB_SCRIPT_CHAM                        = HB_TAG ('C','h','a','m'),
  /*5.1*/ HB_SCRIPT_KAYAH_LI                    = HB_TAG ('K','a','l','i'),
  /*5.1*/ HB_SCRIPT_LEPCHA                      = HB_TAG ('L','e','p','c'),
  /*5.1*/ HB_SCRIPT_LYCIAN                      = HB_TAG ('L','y','c','i'),
  /*5.1*/ HB_SCRIPT_LYDIAN                      = HB_TAG ('L','y','d','i'),
  /*5.1*/ HB_SCRIPT_OL_CHIKI                    = HB_TAG ('O','l','c','k'),
  /*5.1*/ HB_SCRIPT_REJANG                      = HB_TAG ('R','j','n','g'),
  /*5.1*/ HB_SCRIPT_SAURASHTRA                  = HB_TAG ('S','a','u','r'),
  /*5.1*/ HB_SCRIPT_SUNDANESE                   = HB_TAG ('S','u','n','d'),
  /*5.1*/ HB_SCRIPT_VAI                         = HB_TAG ('V','a','i','i'),

  /*5.2*/ HB_SCRIPT_AVESTAN                     = HB_TAG ('A','v','s','t'),
  /*5.2*/ HB_SCRIPT_BAMUM                       = HB_TAG ('B','a','m','u'),
  /*5.2*/ HB_SCRIPT_EGYPTIAN_HIEROGLYPHS        = HB_TAG ('E','g','y','p'),
  /*5.2*/ HB_SCRIPT_IMPERIAL_ARAMAIC            = HB_TAG ('A','r','m','i'),
  /*5.2*/ HB_SCRIPT_INSCRIPTIONAL_PAHLAVI       = HB_TAG ('P','h','l','i'),
  /*5.2*/ HB_SCRIPT_INSCRIPTIONAL_PARTHIAN      = HB_TAG ('P','r','t','i'),
  /*5.2*/ HB_SCRIPT_JAVANESE                    = HB_TAG ('J','a','v','a'),
  /*5.2*/ HB_SCRIPT_KAITHI                      = HB_TAG ('K','t','h','i'),
  /*5.2*/ HB_SCRIPT_LISU                        = HB_TAG ('L','i','s','u'),
  /*5.2*/ HB_SCRIPT_MEETEI_MAYEK                = HB_TAG ('M','t','e','i'),
  /*5.2*/ HB_SCRIPT_OLD_SOUTH_ARABIAN           = HB_TAG ('S','a','r','b'),
  /*5.2*/ HB_SCRIPT_OLD_TURKIC                  = HB_TAG ('O','r','k','h'),
  /*5.2*/ HB_SCRIPT_SAMARITAN                   = HB_TAG ('S','a','m','r'),
  /*5.2*/ HB_SCRIPT_TAI_THAM                    = HB_TAG ('L','a','n','a'),
  /*5.2*/ HB_SCRIPT_TAI_VIET                    = HB_TAG ('T','a','v','t'),

  /*6.0*/ HB_SCRIPT_BATAK                       = HB_TAG ('B','a','t','k'),
  /*6.0*/ HB_SCRIPT_BRAHMI                      = HB_TAG ('B','r','a','h'),
  /*6.0*/ HB_SCRIPT_MANDAIC                     = HB_TAG ('M','a','n','d'),

  /*6.1*/ HB_SCRIPT_CHAKMA                      = HB_TAG ('C','a','k','m'),
  /*6.1*/ HB_SCRIPT_MEROITIC_CURSIVE            = HB_TAG ('M','e','r','c'),
  /*6.1*/ HB_SCRIPT_MEROITIC_HIEROGLYPHS        = HB_TAG ('M','e','r','o'),
  /*6.1*/ HB_SCRIPT_MIAO                        = HB_TAG ('P','l','r','d'),
  /*6.1*/ HB_SCRIPT_SHARADA                     = HB_TAG ('S','h','r','d'),
  /*6.1*/ HB_SCRIPT_SORA_SOMPENG                = HB_TAG ('S','o','r','a'),
  /*6.1*/ HB_SCRIPT_TAKRI                       = HB_TAG ('T','a','k','r'),

  /*
   * Since: 0.9.30
   */
  /*7.0*/ HB_SCRIPT_BASSA_VAH                   = HB_TAG ('B','a','s','s'),
  /*7.0*/ HB_SCRIPT_CAUCASIAN_ALBANIAN          = HB_TAG ('A','g','h','b'),
  /*7.0*/ HB_SCRIPT_DUPLOYAN                    = HB_TAG ('D','u','p','l'),
  /*7.0*/ HB_SCRIPT_ELBASAN                     = HB_TAG ('E','l','b','a'),
  /*7.0*/ HB_SCRIPT_GRANTHA                     = HB_TAG ('G','r','a','n'),
  /*7.0*/ HB_SCRIPT_KHOJKI                      = HB_TAG ('K','h','o','j'),
  /*7.0*/ HB_SCRIPT_KHUDAWADI                   = HB_TAG ('S','i','n','d'),
  /*7.0*/ HB_SCRIPT_LINEAR_A                    = HB_TAG ('L','i','n','a'),
  /*7.0*/ HB_SCRIPT_MAHAJANI                    = HB_TAG ('M','a','h','j'),
  /*7.0*/ HB_SCRIPT_MANICHAEAN                  = HB_TAG ('M','a','n','i'),
  /*7.0*/ HB_SCRIPT_MENDE_KIKAKUI               = HB_TAG ('M','e','n','d'),
  /*7.0*/ HB_SCRIPT_MODI                        = HB_TAG ('M','o','d','i'),
  /*7.0*/ HB_SCRIPT_MRO                         = HB_TAG ('M','r','o','o'),
  /*7.0*/ HB_SCRIPT_NABATAEAN                   = HB_TAG ('N','b','a','t'),
  /*7.0*/ HB_SCRIPT_OLD_NORTH_ARABIAN           = HB_TAG ('N','a','r','b'),
  /*7.0*/ HB_SCRIPT_OLD_PERMIC                  = HB_TAG ('P','e','r','m'),
  /*7.0*/ HB_SCRIPT_PAHAWH_HMONG                = HB_TAG ('H','m','n','g'),
  /*7.0*/ HB_SCRIPT_PALMYRENE                   = HB_TAG ('P','a','l','m'),
  /*7.0*/ HB_SCRIPT_PAU_CIN_HAU                 = HB_TAG ('P','a','u','c'),
  /*7.0*/ HB_SCRIPT_PSALTER_PAHLAVI             = HB_TAG ('P','h','l','p'),
  /*7.0*/ HB_SCRIPT_SIDDHAM                     = HB_TAG ('S','i','d','d'),
  /*7.0*/ HB_SCRIPT_TIRHUTA                     = HB_TAG ('T','i','r','h'),
  /*7.0*/ HB_SCRIPT_WARANG_CITI                 = HB_TAG ('W','a','r','a'),

  /*8.0*/ HB_SCRIPT_AHOM                        = HB_TAG ('A','h','o','m'),
  /*8.0*/ HB_SCRIPT_ANATOLIAN_HIEROGLYPHS       = HB_TAG ('H','l','u','w'),
  /*8.0*/ HB_SCRIPT_HATRAN                      = HB_TAG ('H','a','t','r'),
  /*8.0*/ HB_SCRIPT_MULTANI                     = HB_TAG ('M','u','l','t'),
  /*8.0*/ HB_SCRIPT_OLD_HUNGARIAN               = HB_TAG ('H','u','n','g'),
  /*8.0*/ HB_SCRIPT_SIGNWRITING                 = HB_TAG ('S','g','n','w'),

  /*
   * Since 1.3.0
   */
  /*9.0*/ HB_SCRIPT_ADLAM                       = HB_TAG ('A','d','l','m'),
  /*9.0*/ HB_SCRIPT_BHAIKSUKI                   = HB_TAG ('B','h','k','s'),
  /*9.0*/ HB_SCRIPT_MARCHEN                     = HB_TAG ('M','a','r','c'),
  /*9.0*/ HB_SCRIPT_OSAGE                       = HB_TAG ('O','s','g','e'),
  /*9.0*/ HB_SCRIPT_TANGUT                      = HB_TAG ('T','a','n','g'),
  /*9.0*/ HB_SCRIPT_NEWA                        = HB_TAG ('N','e','w','a'),

  /*
   * Since 1.6.0
   */
  /*10.0*/HB_SCRIPT_MASARAM_GONDI               = HB_TAG ('G','o','n','m'),
  /*10.0*/HB_SCRIPT_NUSHU                       = HB_TAG ('N','s','h','u'),
  /*10.0*/HB_SCRIPT_SOYOMBO                     = HB_TAG ('S','o','y','o'),
  /*10.0*/HB_SCRIPT_ZANABAZAR_SQUARE            = HB_TAG ('Z','a','n','b'),

  /*
   * Since 1.8.0
   */
  /*11.0*/HB_SCRIPT_DOGRA                       = HB_TAG ('D','o','g','r'),
  /*11.0*/HB_SCRIPT_GUNJALA_GONDI               = HB_TAG ('G','o','n','g'),
  /*11.0*/HB_SCRIPT_HANIFI_ROHINGYA             = HB_TAG ('R','o','h','g'),
  /*11.0*/HB_SCRIPT_MAKASAR                     = HB_TAG ('M','a','k','a'),
  /*11.0*/HB_SCRIPT_MEDEFAIDRIN                 = HB_TAG ('M','e','d','f'),
  /*11.0*/HB_SCRIPT_OLD_SOGDIAN                 = HB_TAG ('S','o','g','o'),
  /*11.0*/HB_SCRIPT_SOGDIAN                     = HB_TAG ('S','o','g','d'),

  /* No script set. */
  HB_SCRIPT_INVALID                             = HB_TAG_NONE,

  /* Dummy values to ensure any hb_tag_t value can be passed/stored as hb_script_t
   * without risking undefined behavior.  Include both a signed and unsigned max,
   * since technically enums are int, and indeed, hb_script_t ends up being signed.
   * See this thread for technicalities:
   *
   *   https://lists.freedesktop.org/archives/harfbuzz/2014-March/004150.html
   */
  _HB_SCRIPT_MAX_VALUE                          = HB_TAG_MAX, /*< skip >*/
  _HB_SCRIPT_MAX_VALUE_SIGNED                   = HB_TAG_MAX_SIGNED /*< skip >*/

} hb_script_t;


/* Script functions */

HB_EXTERN hb_script_t
hb_script_from_iso15924_tag (hb_tag_t tag);

HB_EXTERN hb_script_t
hb_script_from_string (const char *str, int len);

HB_EXTERN hb_tag_t
hb_script_to_iso15924_tag (hb_script_t script);

HB_EXTERN hb_direction_t
hb_script_get_horizontal_direction (hb_script_t script);


/* User data */

typedef struct hb_user_data_key_t {
  /*< private >*/
  char unused;
} hb_user_data_key_t;

typedef void (*hb_destroy_func_t) (void *user_data);


/* Font features and variations. */

typedef struct hb_feature_t {
  hb_tag_t      tag;
  uint32_t      value;
  unsigned int  start;
  unsigned int  end;
} hb_feature_t;

HB_EXTERN hb_bool_t
hb_feature_from_string (const char *str, int len,
                        hb_feature_t *feature);

HB_EXTERN void
hb_feature_to_string (hb_feature_t *feature,
                      char *buf, unsigned int size);

/**
 * hb_variation_t:
 *
 * Since: 1.4.2
 */
typedef struct hb_variation_t {
  hb_tag_t tag;
  float    value;
} hb_variation_t;

HB_EXTERN hb_bool_t
hb_variation_from_string (const char *str, int len,
                          hb_variation_t *variation);

HB_EXTERN void
hb_variation_to_string (hb_variation_t *variation,
                        char *buf, unsigned int size);


HB_END_DECLS

#endif /* HB_COMMON_H */
